Pros : Easy to use, shape is very recognizable, finished piece becomes a necklace quick with silk ribbons/leather. I bought it to make Christmas ornaments for some wine-loving friends.
Cons : Only makes 1 at a time, post in the center could be fragile; I used the Primo Primer ONCE. After a 24-hour soak in water poking at the edges with a toothpick, it finally released from mold. The Boron Nitride spray allows for a MUCH easier release. I won't use the Primo Primer in a mold with a post again.
Other Thoughts : I agree with the prior user that noted 0.7 ounces (just under 20 grams) as the appropriate fill weight.